Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
  • B22D17/04—Plunger machines
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/2015—Means for forcing the molten metal into the die
  • B22D17/2023—Nozzles or shot sleeves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/2015—Means for forcing the molten metal into the die
  • B22D17/203—Injection pistons
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/2015—Means for forcing the molten metal into the die
  • B22D17/2038—Heating, cooling or lubricating the injection unit
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/30—Accessories for supplying molten metal, e.g. in rations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/32—Controlling equipment

Definitions

• the invention relates to a conveying device for a molten metal in an injection pressure unit, with a reservoir for the molten metal and a delivery channel in which the molten metal is fed to a mold cavity, wherein the delivery channel comprises a cylinder bore in which a piston is arranged axially adjustable, and wherein in the cylinder bore a collecting chamber for the molten metal is provided, from which the metal melt can be introduced as a result of an axial displacement of the piston by a further line in the mold cavity.
• a liquid metal which is usually a metal alloy, is introduced into a mold cavity and cures therein, so that a metallic component corresponding to the mold cavity is formed.
• the introduction of the molten metal takes place under a pressure under which the molten metal is set.
• a conveying device for a molten metal in which the molten metal is supplied from a reservoir of a cylinder bore formed in a collection chamber, after which a piston in the cylinder bore is axially displaced, whereby the molten metal from the collection chamberuß- is pressed and passes into a further line in which it is supplied to the mold cavity.
• the quality of the metal component produced with a corresponding injection molding unit depends essentially on the fact that the molten metal has sufficient fluidity on its conveying path between the reservoir and the mold cavity and not on the
• the invention has for its object to provide a conveying device for a molten metal in an injection pressure unit, in which a good flowability can be achieved on the conveyor even for different metal materials.
• Collection chamber is formed, is surrounded by a first heater, which has at least one heating element.
• a first heater which has at least one heating element.
• Reservoir and the mold cavity at least section ⁇ way to set or hold by using a first heater to a desired temperature to prevent the molten metal loses its flow path on its conveyor.
• the further advantage is connected to the Ver ⁇ application of the first heater in the cylinder bore, the molten metal in the reservoir must not be excessively heated, so that the risk is prevented that further by the excessive heating of the molten metal in the reservoir Attachments, especially electronic controls or drive devices of winning- direction damaged or they are limited in their function.
• the first heater comprises a plurality of evenly distributed over the circumference of the cylinder bore, in particular arranged heating elements, which may for example be at a radial distance from the cylinder bore and parallel to this.
• the heating elements may be formed by electric heating cartridges, which are each inserted into a bore in the housing of the conveying device.
• the heating cartridges are an electrical resistance heating, but alternatively it is also possible for the first heating device to be formed by channels through which a hot fluid, in particular a hot liquid, flows.
• the number and arrangement of the heating elements depends on the size of the injection molding device and in particular the
• Cylinder bore in practice, it has as made sense when four to eight heating elements
• An exact temperature of the wall of the cylinder bore and the surrounding components and thus the molten metal can be achieved if the heating elements are individually and / or group-controlled.
• a control can be used in which the temperature of the individual heating elements and / or molten metal and / or the wall of the cylinder bore is detected and evaluated, wherein the heating elements are controlled individually or in groups to a desired temperature or a to achieve the desired temperature profile.
• the piston can axially within the cylinder bore
• a preferably electric or hyraulische drive device and / or an electronic control device may be provided, which are usually arranged at the upper, the collection chamber remote from the end of the piston.
• the drive device and / or the control device are temperature-sensitive components that tend to malfunction if overheated. To ensure proper operation of the drive device and / or the
• the Cooling device may either be an electrical cooling device, For example, a Peltier element, or act to cooling channels, which are traversed by a cooling fluid and in particular a cooling liquid.
• a partition wall is provided, which is penetrated by the piston.
• the partition serves as a heat shield and shields the area heated by the heater and the area cooled by the cooler.
• the partition by means of the cooling device is cooled by, for example, a cooling channel is integrated into the partition.
• the piston has an axial bore in which a valve rod is slidably received.
• the valve rod at its end facing away from the collection chamber has a Ventilstangen- drive device, in particular in the form of an electric drive motor or a hydraulic Antriebsvorrichtun and / or an electronic control device, wherein the valve rod driving device and / or the control device by means of the cooling device can be cooled is. In this way, a proper function of the valve rod drive device and / or the control device and thus the valve stem is ensured.
• the molten metal is forced out of the collection chamber by the piston and enters a further line, in which usually a check valve is arranged.
• a check valve is assigned a third heating device which can be controlled independently of the first heating device for the cylinder bore and independently of the second heating device for the reservoir.
• Both the second heating device and the third heating device can be formed by electrical resistance heaters, for example heating cartridges, but it is also possible to provide heating channels through which a hot fluid and in particular a hot fluid flows. Further details and features of the invention will become apparent from the following description of an embodiment with reference to the drawings. Show it:
• Fig. 1 is a longitudinal section through an inventive
• Fig. 2 is an enlarged perspective view of
• a conveying device 10 for a molten metal M in an injection-pressure unit shown in FIG. 1 has a housing 11 in which a vertical receiving bore 12 is formed.
• a reservoir 26 is provided, which is filled with the molten metal M.
• the molten metal M can be supplied in liquid form to the reservoir 26 or be generated in this by melting, for example, a metal granules.
• the reservoir 26 is airtight covered by a cover member 45 and formed above the molten metal in the reservoir 26 space 46 is filled with a protective gas, such as carbon dioxide (C0 2 ) or nitrogen (N 2 ).
• a protective gas such as carbon dioxide (C0 2 ) or nitrogen (N 2 ).
• a second heating device 43 is integrated in the region of the reservoir 26, which may be an electrical resistance heater, with which the wall of the reservoir 26 and thus the metal M melt can be brought to a desired temperature or held on this.
• the reservoir 26 is connected via at least one obliquely downwardly in the flow direction inclined inlet channel 18 with the receiving bore 12 in connection.
• a fitting 28 is inserted with close fit, which has a tubular configuration and is closed at its lower end.
• the fitting 28 is replaceably held in the receiving bore 12 and has a central axial cylinder bore 27 which is configured in the form of an upwardly opening blind bore.
• an obliquely extending connecting bore 30 is provided, which is aligned with the inlet channel 18 and this with the
• Cylinder bore 27 connects.
• a piston 13 is slidably inserted under close fit. In an area arranged in the lower half of the axial length of the piston 13, an axial distance from the lower end of the
• annular space 17 is formed on the outside of the piston 13. At the lower end of the annular space 17 several extend over the circumference of the piston thirteenth
• the piston rings 31 consist example ⁇ example of a spring steel.
• the piston 13 further comprises a central axial bore 14 in which a valve rod 19 is slidably disposed, which completely penetrates the piston 13 and at its lower end downstream of the end face of
• Piston 13 carries a plate-like valve body 20.
• the valve body 20 can be adjusted by moving the valve rod 19 relative to the piston 13 between a closed position shown in Figure 1, in which the valve body 20 prevents leakage of molten metal from the filling holes 16, and an open position, not shown, in which the molten metal from the Fill holes in an underlying, formed in the cylinder bore 27 collecting chamber 15 can flow.
• the cross section of the valve body 20 is smaller than the cross section of the cylinder bore 27, so that the valve body 20 within the cylinder bore 27 has a sealing function and the molten metal M, the valve body 20 can flow freely.
• the cylinder bore 27 and the collection chamber 15 formed in its lower region is connected at the lower end via a continuing line 21 with a not more detail Darge ⁇ set mold cavity.
• the continuing line 21 comprises a lower transverse bore 32 in the wall of the fitting 28, which is aligned with a further transverse bore 33 in the housing 21, via which the collecting chamber 15 is connected to a vertical riser 22.
• the riser 22 passes at its upper end in a filling channel 23, from which the molten metal is supplied to the mold space, as indicated by the arrow F.
• a check valve 24 is arranged, which has a valve body 25 which is tensioned by a spring 34 against the flow direction against a valve seat 35.
• the cylinder bore 27 and the fitting piece 28 are surrounded by a first heater 36, which has a plurality of distributed over the circumference of the fitting piece 28 arranged heating elements 37, each formed in a housing
• FIG. 1 The arrangement of the heating elements 37, which are preferably electrical heating cartridges, is shown in FIG. It can be seen that six heating elements 37 are provided which are distributed uniformly over the circumference of the fitting piece 28 and preferably each individually or in groups can be controlled. With the help of the heating device 36, it is possible to bring the molten metal M in the region of the connecting bore 30, the filling holes 16, the collecting chambers 15 and at least partially in the continuing line 21 to a desired temperature or to keep this. As indicated by dashed lines in Figure 1, is the
• Non-return valve 24 a third heating device 44 associated with the molten metal, which flows through the check valve 24, in particular within the check valve 24 is tempered.
• the third heating device 44 may be formed by an electrical resistance heating or heating channels, which are flowed through by a hot fluid and in particular a hot liquid.
• the collecting chamber 15 facing away from the end of the piston 13 and the valve rod 19 is arranged in a outside of the housing 11 arranged drive and control housing 47, in which an only indicated drive device 38 for the piston 13 and also also only indicated
• Valve rod driving device 41 are arranged, with which the piston 13 and the valve rod 19 are axially adjustable. Also within the drive and
• Control housing 47 is an electronic control device 48 is provided in particular for the said drive devices, which is only indicated schematically.
• the drive and control housing 47 has on its side facing the housing 11 a partition wall 40 which is penetrated by the piston 13 and the valve rod 19 under close fit and which serves as a thermal shield.
• a cooling device 39 which comprises a plurality of cooling channels 42, which are flowed through by a cooling liquid and extend through both the drive and control housing 47 and through the partition 40.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (2)

Family

ID=55080076

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Citations (1)

Family Cites Families (17)

• 2014
  • 2014-12-19 DE DE102014018798.5A patent/DE102014018798A1/de not_active Withdrawn
• 2015
  • 2015-12-15 US US15/535,888 patent/US10675677B2/en not_active Expired - Fee Related
  • 2015-12-15 EP EP15822908.8A patent/EP3233331B1/de active Active
  • 2015-12-15 WO PCT/EP2015/002517 patent/WO2016096120A2/de active Application Filing
  • 2015-12-15 CN CN201580073565.5A patent/CN107206478B/zh active Active
  • 2015-12-15 JP JP2017532943A patent/JP6749328B2/ja not_active Expired - Fee Related
  • 2015-12-15 CA CA2971496A patent/CA2971496A1/en not_active Abandoned

Patent Citations (1)

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